Apple ID “(null)” and unable to sign-out

After signing in successfully once with my Appleid on my new phone, I have been promoted to sign in to iCloud with the following message “Enter the password for your Apple ID “(null)”.

My Apple ID is not “null” and I am unable to sign out of the phone.

Whenever I click on “sign-out”, it just takes me back to the Home Screen.

i tried to enter my Apple ID password but the next pop up says “You must enter both your Apple ID and password” but I do not have a way to enter my Apple ID.

I tried to reset my iPhone but I can’t proceed as it’s still promoting me to enter my password for Apple ID “ “.

Any help is much appreciated. Thank you.